Could you please explain what lie groups are and why you think it's applicable to finance (suggest areas of application})? This would make a much better question and it would be much more useful for other users of the site.
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SRKX♦Apr 20 '12 at 6:21

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Please provide a link to a finance article that makes explicit use of lie group theory
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Alexey KalmykovApr 20 '12 at 10:22

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Where did you see this? I've never heard of lie groups applied to finance.
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chrisaycockApr 20 '12 at 12:49

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Well, we do use $\mathbb{R}^n$ all the time.
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Brian BApr 20 '12 at 15:49

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I've updated the question with some papers
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pyCthonApr 21 '12 at 18:38

1 Answer
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I didn't read the papers you linked but I can understand that lie groups may be used much as there are used in quantum field theories to build up gauge theories for interaction of particles. The purpose is to have a model that is invariant according to a given transformation group. This introduce interaction terms in the equations.

I can imagine that the same technique can be used in financial stochastic processes to force the introduction of new terms in the equations.